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Spring webflow/dojo problem only in IE6 and IE7

I have project that is realized in Spring webflow where dojo is used. Everything goes fine until I check how looks my pages under all browser.

Under FF2, FF3.5, Opera, Chrome, IE8 everything works.
Only one browser (IE7) has problems with dojo. IE6 also doesn't work but this version is not important for me.

Problem details under IE7:

All decorations are OK. Checking validation "on submit" OK also (prevent before submitting incomplete data). Problem is when data are incomplete. Validation mechanism blocks submit but user have no idea what is wrong. Dojo doesn't show warning icon (yellow triangle with exclamation mark).